Malicious PDF — malware analysis report

Static analysis result for SHA-256 0435125f377c7813…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 16:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 003ff24c87baf4b147dcbe054d904614 SHA-1: 43826cd3cbe60e7df211ee070d9181bc9c5d2f3c SHA-256: 0435125f377c781308e23c2ac88977f05e827f85f9405ac33d3f935532e69496
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=tractive+gps+cat+manual PDF link annotation
    • http://ashokarefrigeration.com/userfiles/file/femizupexeva.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/tolivimumedomofezukibadif.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/lidojokodaduguju.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6a57f5d1---17916358072.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a4ea74c85---xapos.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pasivutu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066452ddb77---xumogitadiwego.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/bugomefajuwan.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/dovelunuxonalozuvetep.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/57r8ug6pj1ubf4jj5hlf4n6e00/44365490642.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sevojizebirokuf.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/bisabu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6eb0bc087d2cb89b1f6e3ede8b6fa743/95459468264.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1b4abe8588061b8c33c2054127b7f601/surejug.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/g7i7qjqd71ogg4aapms0rg9074/81922047698.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/rujikabunurasoru.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f94126919---82990259169.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/5201420105.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/munaxurowejaloxelidoko.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fetujilibijonemefazolopu.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/fowimumimabegamalim.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/32030791494.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/10780302394.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 20100 bytes
SHA-256: a58470117c429ad943e9fb20755a04ea547d7cdc5d3bc682e4082519b05ab4fc
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 10724 bytes
SHA-256: c2ce06b170b47004f527e4e3d19f78816e049fe1e36e6a0f985791f4b90f002a